Telephone set base



FIG. 1 is a perspective view of a telephone set base showing my new design;

FIG. 2 is a side view with the side opposite being substantially a mirror image of the side shown;

FIG. 3 is a front view;

FIG. 4 is a back view; and

FIG. 5 is a bottom plan view. 

The ornamental design for a telephone set base, as shown and described. 